Abstract FR:

In this current work, to introduce, the biological and economic stakes in the fishery management have been outlined, then the marines protected areas (MPAs) issues notably in high seas has been presented. In its second part, the network structure of the bioeconomic system, from tuna stocks to markets, has been illustrated. It shows how to homogenize catch data extracted from Sardara database and markets data from Fishstat database taking into account the network structure drawn. A detailed analysis of data already homogenized is hence suggested. In the last part, a bioeconomic model of the global chain is implemented. This model is based on the network equilibrium concept. The network considered is described as large scale because it includes about 1000 biological and economic links. The algorithms used to compute the network equilibrium are provided in appendix and the iterative process are made for several years. Indeed, this work is designed to develop and analyze di#erent scenarios including the implementation of MPAs. Results of scenarios tested are then presented before concluding.